In recent years the number of motor vehicles – and the pollution they generate – has grown astronomically, leading some citydwellers to wear facemasks in the hopes of protecting themselves. So do they work?

The latest salvo of insults and threats between President Trump and North Korea's Kim brought the region a little bit closer to war. China, North Korea's closest trading partner, may be the only way out.

The president said he's considering ending trade with any country that does business with North Korea. Here's why that will never happen.

A Japanese man watches a TV news program on a public screen in Tokyo showing North Korean leader Kim Jong Un amid reports the North Korean leader has inspected a hydrogen bomb meant for a new intercontinental ballistic missile.
(AP Photo/Eugene Hoshiko)September 5, 2017